package com.bit.demo.springbookdemo.interceptor;

import com.bit.demo.springbookdemo.constant.Constant;
import com.bit.demo.springbookdemo.model.Result;
import com.bit.demo.springbookdemo.model.UserInfo;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

@Slf4j
@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("preHandle...");
        HttpSession session = request.getSession(false);
        if(!checkUser(session)){
            response.setContentType("text/html;charset=utf-8");
            response.setStatus(401);
            String msg="用户未登录";
            response.getOutputStream().write(msg.getBytes("UTF-8"));
            return false;
        }
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        log.info("afterCompletion...");
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        log.info("postHandle...");
    }


    private boolean checkUser(HttpSession session){
        if(session==null || session.getAttribute(Constant.SESSION_USER_KEY)==null){
            log.warn("查询图书失败,用户未登录");
            return false;
        }
        UserInfo userInfo=(UserInfo) session.getAttribute(Constant.SESSION_USER_KEY);
        if(userInfo==null || userInfo.getId()<=0){
            log.warn("查询图书失败,用户未登录");
            return false;
        }
        log.info("用户登录成功,用户id:{}",userInfo.getId());
        return true;
    }
}
